package com.leyou.item.service;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.leyou.common.constants.MQConstants;
import com.leyou.common.enums.ExceptionEnum;
import com.leyou.common.exceptions.LyException;
import com.leyou.common.utils.BeanHelper;
import com.leyou.common.vo.PageResult;
import com.leyou.item.dto.*;
import com.leyou.item.entity.Sku;
import com.leyou.item.entity.Spu;
import com.leyou.item.entity.SpuDetail;
import com.leyou.item.mapper.SkuMapper;
import com.leyou.item.mapper.SpuDetailMapper;
import com.leyou.item.mapper.SpuMapper;
import org.apache.commons.lang3.StringUtils;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;
import tk.mybatis.mapper.entity.Example;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @author 虎哥
 */
@Service
public class GoodsService {

    @Autowired
    private SpuMapper spuMapper;

    @Autowired
    private SpuDetailMapper detailMapper;

    public PageResult<SpuDTO> querySpuByPage(String key, Integer page, Integer rows, Boolean saleable) {
        // 1.构建搜索条件
        Example example = new Example(Spu.class);
        // 2.过滤条件
        Example.Criteria criteria = example.createCriteria();
        // 2.1.上下架过滤
        if (saleable != null) {
            criteria.andEqualTo("saleable", saleable);
        }
        // 2.2.关键字过滤
        if (StringUtils.isNotBlank(key)) {
            criteria.andLike("name", "%" + key + "%");
        }
        // 3.排序
        example.setOrderByClause("update_time DESC");
        // 4.分页
        PageHelper.startPage(page, rows);
        // 5.开始查询
        List<Spu> list = spuMapper.selectByExample(example);
        if (CollectionUtils.isEmpty(list)) {
            throw new LyException(ExceptionEnum.GOODS_NOT_FOUND);
        }
        // 6.解析结果
        // 6.1.处理分页结果
        PageInfo<Spu> info = new PageInfo<>(list);
        // 6.2.处理DTO
        List<SpuDTO> dtoList = BeanHelper.copyWithCollection(list, SpuDTO.class);
        // 6.3.处理分类和品牌名称
        handleCategoryBrandName(dtoList);
        return new PageResult<>(info.getTotal(), info.getPages(), dtoList);
    }

    @Autowired
    private BrandService brandService;

    @Autowired
    private CategoryService categoryService;

    private void handleCategoryBrandName(List<SpuDTO> dtoList) {
        for (SpuDTO dto : dtoList) {
            // 分类名称
            List<Long> ids = dto.getCategoryIds();
            /*List<CategoryDTO> list  = categoryService.queryByIdList(ids);

            StringBuilder sb = new StringBuilder();
            for (CategoryDTO categoryDTO : list) {
                sb.append(categoryDTO.getName()).append("/");
            }
            if(sb.length() > 1) {
                sb.deleteCharAt(sb.length() - 1);
            }
            dto.setCategoryName(sb.toString());
            */
            String names = categoryService.queryByIdList(ids)
                    .stream()
                    .map(CategoryDTO::getName)
                    .collect(Collectors.joining("/"));
            dto.setCategoryName(names);

            // 品牌的名称
            Long brandId = dto.getBrandId();
            BrandDTO brand = brandService.queryById(brandId);
            dto.setBrandName(brand.getName());
        }
    }

    @Autowired
    private SkuMapper skuMapper;

    @Transactional
    public void saveGoods(SpuDTO spuDTO) {
        Spu spu = BeanHelper.copyProperties(spuDTO, Spu.class);
        // 默认下架
        spu.setSaleable(false);
        // 1.新增spu数据
        spuMapper.insertSelective(spu);

        // 2.新增spuDetail数据
        SpuDetail detail = BeanHelper.copyProperties(spuDTO.getSpuDetail(), SpuDetail.class);
        detail.setSpuId(spu.getId());
        detailMapper.insertSelective(detail);

        // 3.新增sku数据
        insertSku(spuDTO.getSkus(), spu.getId());
    }

    private void insertSku(List<SkuDTO> skuDTOList, Long spuId) {
        List<Sku> skuList = new ArrayList<>();
        for (SkuDTO skuDTO : skuDTOList) {
            // 转换DTO
            Sku sku = BeanHelper.copyProperties(skuDTO, Sku.class);
            sku.setSpuId(spuId);
            // 默认是下架
            sku.setEnable(false);
            skuList.add(sku);
        }
        skuMapper.insertList(skuList);
    }

    @Autowired
    private AmqpTemplate amqpTemplate;

    @Transactional
    public void updateSaleable(Long id, Boolean saleable) {
        // 1.更新spu  update tb_spu set saleable=1 where id = 1
        Spu spu = new Spu();
        spu.setId(id);
        spu.setSaleable(saleable);
        int count = spuMapper.updateByPrimaryKeySelective(spu);
        if (count != 1) {
            throw new LyException(ExceptionEnum.UPDATE_OPERATION_FAIL);
        }
        // 2.更新sku update tb_sku set saleable=1 where spu_id = 1
        // 2.1.要更新的数据
        Sku sku = new Sku();
        sku.setEnable(saleable);
        // 2.2.更新的where条件
        Example example = new Example(Sku.class);
        example.createCriteria().andEqualTo("spuId", id);
        count = skuMapper.updateByExampleSelective(sku, example);

        int size = skuMapper.selectCountByExample(example);
        if (count != size) {
            throw new LyException(ExceptionEnum.UPDATE_OPERATION_FAIL);
        }

        // 发送商品上架或下架的消息
        String routingKey = saleable ? MQConstants.RoutingKey.ITEM_UP_KEY : MQConstants.RoutingKey.ITEM_DOWN_KEY;
        amqpTemplate.convertAndSend(MQConstants.Exchange.ITEM_EXCHANGE_NAME, routingKey, id);
    }

    public SpuDTO querySpuById(Long id) {
        // 1.查询spu
        Spu spu = spuMapper.selectByPrimaryKey(id);
        if (spu == null) {
            throw new LyException(ExceptionEnum.GOODS_NOT_FOUND);
        }
        SpuDTO spuDTO = BeanHelper.copyProperties(spu, SpuDTO.class);

        // 2.查询spuDetail
        spuDTO.setSpuDetail(queryDetailBySpuId(id));
        // 3.查询skus
        spuDTO.setSkus(querySkuBySpuId(id));
        return spuDTO;
    }

    public List<SkuDTO> querySkuBySpuId(Long id) {
        Sku sku = new Sku();
        sku.setSpuId(id);
        List<Sku> list = skuMapper.select(sku);
        if (CollectionUtils.isEmpty(list)) {
            throw new LyException(ExceptionEnum.GOODS_NOT_FOUND);
        }
        return BeanHelper.copyWithCollection(list, SkuDTO.class);
    }

    public SpuDetailDTO queryDetailBySpuId(Long id) {
        SpuDetail detail = detailMapper.selectByPrimaryKey(id);
        if (detail == null) {
            throw new LyException(ExceptionEnum.GOODS_NOT_FOUND);
        }
        return BeanHelper.copyProperties(detail, SpuDetailDTO.class);
    }

    @Transactional
    public void updateGoods(SpuDTO spuDTO) {
        Spu spu = BeanHelper.copyProperties(spuDTO, Spu.class);
        spu.setSaleable(null);
        // 1.修改spu表
        int count = spuMapper.updateByPrimaryKeySelective(spu);
        if (count != 1) {
            throw new LyException(ExceptionEnum.UPDATE_OPERATION_FAIL);
        }

        // 2.修改spuDetail
        SpuDetail detail = BeanHelper.copyProperties(spuDTO.getSpuDetail(), SpuDetail.class);
        count = detailMapper.updateByPrimaryKeySelective(detail);
        if (count != 1) {
            throw new LyException(ExceptionEnum.UPDATE_OPERATION_FAIL);
        }

        // 3.删除sku
        Long spuId = spu.getId();
        Sku sku = new Sku();
        sku.setSpuId(spuId);

        int size = skuMapper.selectCount(sku);
        if (size > 0) {
            count = skuMapper.delete(sku);
            if (count != size) {
                throw new LyException(ExceptionEnum.UPDATE_OPERATION_FAIL);
            }
        }
        // 4.新增sku
        insertSku(spuDTO.getSkus(), spu.getId());

        // 发mq消息
    }

    public List<SkuDTO> querySkuListByIds(List<Long> ids) {
        List<Sku> list = skuMapper.selectByIdList(ids);
        if (CollectionUtils.isEmpty(list)) {
            throw new LyException(ExceptionEnum.GOODS_NOT_FOUND);
        }
        return BeanHelper.copyWithCollection(list, SkuDTO.class);
    }

    @Transactional
    public void minusStock(Map<Long, Integer> skuMap) {
        for (Map.Entry<Long, Integer> entry : skuMap.entrySet()) {
            try {
                skuMapper.minusStock(entry.getKey(), entry.getValue());
            }catch (Exception e){
                throw new LyException(ExceptionEnum.STOCK_NOT_ENOUGH);
            }
        }
    }
}
